With Centrino Hardware Control, you can change you cpu volts and lower your power consumption and heat dissipation.
http://www.pbus-167.com/chc.htm
I'm going to have X31 /w 1,4GHz Centrino this evening. I tested that program with my current laptop, and it's amazing piece of software




Thinkpad X31 28847WU | Banias 1.7GHz | 1024MB RAM | 60GB HDD 7200RPM | X3 Ultra w/ DVD/CDRW | Windows XP Pro | 2 Li Ion Batteries